The Many Faces, and Causes, of Unbelief - Apologetics Press

Such a position inevitably leads to the following. First, deism
rejects both the triune nature of the Godhead and the deity
of Christ. Geisler and Brooks assessed the matter by suggesting
that deists
...believe that God never specially intervenes in the
world to help mankind. Since this also means that Jesus
was not God (that would be a miracle), there is no
reason for them to believe that God is a Trinity. The
idea of three Persons in one nature (the Trinity) is to
them just bad math (1990, p. 40; parenthetical items
in orig.).
Or, as Hoover has noted: “Deists believed in a Supreme Being,
but he was only one in number. They denied the doctrines
of Trinity and Incarnation. Jesus Christ was merely a
great moral teacher” (1976, p. 12). Thus, the deist denies “any
supernatural redemptive act in history” (Harrison, 1966, p.
162).
Second, deism rejects the idea that God has given a special
revelation of Himself in the Bible. For God to reveal Himself
by speaking directly to man would be a miracle—an intervention
into man’s world. This is something the deist is not prepared
to accept. Observation of the general revelation that
God has left of Himself in nature, says the deist, is sufficient
for understanding the Creator and His desires for mankind.
What did a typical deist deny? In one word: intervention....
God didn’t need to reveal anything about
himself in a holy book like the Bible or the Koran.
Nature itself is the only revelation God needs. A rational
man could find out all that he needed to know
about God from nature... (Hoover, p. 13, emp. in orig.).
In summarizing the aversion of the deist to the miraculous,
Roger Dickson noted that “the principle point of concern here
is the deist’s denial of the inspiration of the Bible and miracles.
If God does not intervene in the natural world, then both
are impossible” (1979, p. 118).
Third, deism advocates that human reason alone is all man
needs to understand God and His laws for humankind.
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